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SanDisk SD032 Handbuch Seite 31

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3-5 SanDisk miniSD Card Product Manual, Rev. 1.1 © 2003 SANDISK CORPORATION
CMD
CLK
DAT0-3
SD
Memory
Card
Host
1 2 3 4 5 6 7 8
SD Memory
Card
R
DAT
R
CMD
C
1
C
2
C
3
9
R
WP
Vss
Write Protect
Figure 3-4. Bus Circuitry Diagram
R
DAT
and R
CMD
are pull-up resistors protecting the CMD and the DAT line against bus floating when no card is
inserted or when all card drivers are in a hi-impedance mode.
Hot Insertion/Removal
Hot insertion and removal are allowed: the SanDisk miniSD Card will not be damaged by inserting or removing it
into the SD bus even when the power is up.
• The inserted card will be properly reset also when CLK carries a clock frequency f
PP
.
• The bus master, using the CRC codes that suffix every bus transaction, should detect data transfer
failures induced by removal or insertion.
3.2.1. Power Protection
Cards can be inserted into or removed from the bus without damage. If one of the supply pins (V
DD
or
V
SS
)
is not
connected properly, then the current is drawn through a data line to supply the card.
Data transfer operations are protected by CRC codes; therefore, the SD bus master can detect any bit changes
induced by card insertion and removal. The inserted card must be properly reset also when CLK carries a clock
frequency f
pp.
If the hot insertion feature is implemented in the host, than the host has to withstand a shortcut
between V
DD
and
V
SS
without damage.
3.3. SPI Bus Topology
The miniSD Card, SPI Interface is compatible with SPI hosts available on the market. Similar to any other SPI
device, the miniSD Card’s SPI channel consists of the following four signals:
• CS—Host to card Chip Select signal.
• CLK—Host to card clock signal.
• DataIn—Host to card data signal.
• DataOut—Card to host data signal.
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